Is tantra a word in the Scrabble Dictionary

Yes, tantra is playable

...and is worth 7 points.

Found in the following dictionaries

Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Tantra" Definition

noun

Any of a comparatively recent class of Hindu or Buddhist religious literature written in Sanskrit and concerned with powerful ritual acts of body, speech, and mind.
One of the later Hindu or Buddhist scriptures dealing especially with techniques and rituals including meditative and sexual practices.
The rituals or practices outlined in the tantra.